原子力プラント用免震構造におけるクリフエッジ回避技術に関する研究

抄録

In Japan, base isolation systems have been applied to various architectural structures, civil structures and mechanical structures after the Great Hanshin Earthquake, the seismic isolation is recognized as a common seismic safety technique. However, in the laminated rubber bearing, there is a constraint condition on the outer shape and the shape factor for a stable performance. In this research, in order to study the cliff edge avoidance technology for nuclear power plants, which is an important facility, we have researched and developed laminated seismic isolation devices using urethane elastomer. Polyurethane elastomers have various strong points compared with rubber materials such as an excellent elasticity, mechanical strength, abrasion resistance, weather resistance, oil resistance, impact resistance of the absorbent, anti-vibration and excellent low-temperature properties. Furthermore, it is possible to impart various characteristics by a molecular design of materials . The fundamental characteristic was investigated from several loading tests, and the design formula for the stiffness and equivalent damping coefficient were formulated as an approximate expression of mechanical characteristics.